Electrical insulator.



No. 826,589. PATENTED JULY 24, 1906. M. MEIROWSKY.

ELECTRICAL INSULATOR.

APPLICATION FILED JAN.31. 1905.

2 SHEETSSHEET 1.

Fi l.

PATENTED JULY 24, 1906.

M. MEIROWSKY. ELECTRICAL INSULATOR. APPLICATION FILED JAN. 81.1905.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE. MAX MEIROWSKY, OF COLOGNE-EHRENFELD,GERMANY.

ELECTRICALINSQLATOh.

Specification of Letters Patent.

Patented. July 24, 1906.

Applicatioufiled nuary 31, 1905. Serial No. 24 3,457.

To all whom it may concern: Be it known that 1, MAX MEIROWSKY, a subjectof the King of Prussia, German Emperor, and a resident ofCologne-Ehrenfeld,

implements, tools, and the like, laminated ins'ulation, particularlymica, being preferably,-

employed.

The utilization of laminated insulationfesecially of mica, which hassuch excellentinsu ating qualities, hitherto offered great diffi'r'culties in the case of conductors in the open.

These difficulties are overcome in the case of the presentinsulator,'inthe first place by the laminated insulation being surrounded by 'a cap,preventing thedoosening and coming apart of the laminations, or by micarings, and, in the second place, by both the metal parts and also theparts of the insulation being so arranged and formed that the nonuniformforces which come into action, particularly in the case oftrolley-wires, exercise no injurious effect on the parts of theinsulation, and these parts in caseof need can be easily separatelyexchanged. Moreover, care has been taken to provide large aninsulation-surface as possible in order to prevent leakage-currents.

The invention is illustrated the accom-' panying drawings, in which-F1gure '1 is an elevation of an insulator according tothe presentinvention Fig. 2, a

cross-section of the insulator'shown in Fig; 40

1 partly modified; Fig. 3, a cross-section of 'a modified form ofinsulator; Fig. .4, a crossanother modified form of-insulator, and Fi 5a crpss-section showing the insulation 0 cmica. laminated.

In the case of the form represented in Fig. 1 the one metal part of-theinsulator to be insulated possesses the form of a cap a,'which isprovided with-an opening I; in" its bottom.

The interior of the-capo receives the one end of the other metal part "cto be insulated, which is surrounded with the lating material It, andthe boltor shankpor- "tion of said art passesthroughthe central o eningin-t e bottom of the cape, so that -t e bottom of the capa forms astrong 'coun mass of insu-- cap prevents the lamination of theinsulating mass (1 from opening out and becoming loose. The. cap a hasan external screw ing brid ge is prevented. The mica rings are connectedtogether bymeans of a binding medium-for instance, an adhesive oil,resin,

o1}'--the' like,-wh ich also serves at the sarne I time for filling upossible empty spaces. .Even in the case 0 water trickling down theinsulator moisture which penetrates into the same cannot reach the metalpart c in con sequence of the insulation (1. The insula-' tion is stillmore materially increased by'the shaft of the part c-itself beingsurrounded by axially arranged leaves of mica pressed against said part,.while the mica rings 9 are placed on radially. The mica rings g arepressed firmly together and against the bot- .tom of the cap a by a nut'11, screwed upon the part 0. By means of this pressure, in'the firstplace, the penetration between the mica rings of moisture and of: artsinjurious to the insulation is prevented advantage is obtained thatnon-uniform -pressuresuch as, for example, is present in the case oftrolley-wires'exercises no injurious efiects on the parts 'of the boltsup- In the-interior of ported against the cap a. p the cap a,the-insulation d and the airspace 1c,

situated above it, reliably prevent the trans 7 mission of current. I,

When the thread of the ca s a f are a suitable length, the present insulator can also be used. as a tension or wire-tightening device.

The internally-screwed part f may be provided with an eye m, as shown inFig. 2, or

another suitable device for the attachment of a wire or the like. It isto be understood; however, that. the part f varies with the-uses of theinsulator.

In the case of the embodiment shown, by way of example in Fig: 3 the capa is closed on one side. A 'suflicient amount of laminat'ed insulatingmaterial is pressed into this cap a and surrounds the end of the metalpart c, which is covered on its shaft with insulating material d, saidend being introduced into the 'cap. The insulating material in the andthe further IIO by connected firmly to cap a is pressed down by ascrew-ring l, and, if desired, is thereby moldedinto 1ts final form. Thetwo metal parts a and l are therev ether and completely surround thehead of the other metal part c. The grooved-mica rings surrounding theinsulatedbolt c, which rings render the trans in the case of insulatingtrolley-wires and the like a better appearance is produced.

Although, as above stated, laminated 1nsulating materials, in particularmica, is intended to be principally employed; et the described devicescan, if desired, also e used insulating material can be employed, if'defor plastic insulating material.

Instead of the rings g of mica rings of other sired, or an undividedcase can be placed on the insulation of the bolt 0 and be pressed by thenut '1' against the bottom of the cap a, as shown in Fig. 4. In suitablecases the rings 9 or the like may be also omitted.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a metal cap having an opening at its end, a metalmember lyingpartl in said metal cap, and partly pro ecting t rough theopening in the cap, insulating material surroundn said metal member andpartly surrounded y the metal cap, insulation surrounding the above-mentioned insulating material surrounding the portion 0f the metalmember projecting through the o eningin the cap, and means clamping thea ove-mentioned insulation against the end of the metal cap,substantially as described.

2. The combination of a metal cap, having anopening at its end, a metalmember lying part in said metal cap and partly pro ecting t rough theopening in the cap and having a screw-thread on the latter projectinportion, insulating material surrounding said metal member and partlysurrounded by the metal cap, insulation surrounding the abovementionedinsulating. material surrounding the portion of the metal memberprojecting through the openin in the cap, and a nut on the screw-threado the said metal member pressing the above-mentioned insulation againstthe ends of the metal cap, substantially as described.

3. The combination of a metal cap, having an opening at its end, a metalmember lying part in said-metal cap and partly pro ecting t rough theopening in the cap and having a screw-thread on the'latter projecting ano ening at its end, a metal mem portion, laminated insulating materialsur-- rounding said metal member and partly surrounded by the metal cap,insulation surrounding the abovementioned insulating materialsurrounding the portion of the metal member projecting through theopening in the cap, and a nut on thescrewthread of the said metal memberpressing the abovementioned insulation against the ends of the metalcap, substantially as described.

4. The combination of ametal cap having an opening at both ends andhaving a screwthreaded portion, an adjustable screw-cap engaging withsaid screw-threaded portion and closing the metal cap at one end, ametal member lying partly in said metal cap and partly projectingthrough the opening in the cap and having a screw-thread on the latterprojecting portion, insulating material surrounding said metal memberand partly surrounded by the metal cap, insulation surrounding theabove-mentioned insulating material surrounding the portion of the metalmember projecting through the opening in the cap, and a nut on thescrew-thread of the said metal member pressing the above-mentionedinsulation against the ends of the metal cap, substantially asdescribed.

5. The combination of a metal cap having an opening at its end, a metalmember having a head portion and a shank portion, the head portion lyingin said metal cap and the shank ortion projecting through the 0 )enin inthe cap and having a screw-thread insulating material surrounding saidmetal member and partly surrounded by the metal cap, insulationsurrounding theabove-men- 'tioned insulating material surrounding therojecting shank portion of the metal memtier, and a nut on thescrew-thread of said shank pressin the above-mentioned insulationagainst the end of themetal cap, substantially as described. 6.Thecombination of a metal ca liar lying part I in said metal cap, andpartly pro ecting t rough the opening in the cap, Insulating materialsurrounding said metal member and partly surrounded by the metal cap,insulation consisting of rings having furrows in their circumferencessurrounding the abovementioned insulating material surrounding theportion of the metal member projecting through the opening in the cap,and means clamping the above-mentioned rings against the end of themetal cap, substantially as described.

7. The combination of a metal cap having an o ening at itsend, a metalmember lying part 131 in said metal cap, and partly pro ectrough theopening in the cap, insulating material surrounding said metal memberand partly-surrounded by the metal cap, insulation consisting of micarings having furrows in their circumferences surrounding the havingabove-mentioned insulating material surrounding the portion of the metalmember projecting through the opening in the cap, and means clamping theabove-mentioned mica rings against the end of the metalcap,substantially as described. I

8. The combination of a metal ca having an opening at its end, a metalmem er having a head portion and a shank portion, the head portion lyingin said metal cap and the shank ortion projecting through the open ingin t e cap and having a screw-thread, in-

sulating material surrounding said metal member and partly surrounded bythe metal cap, Insulation consisting of-mica rings having furrows intheir circuinferencessurrounding the above-mentioned insulating materialsurrounding the projecting shank portion of the metal member, and a nuton the screwthread of said shank pressing the above mentioned micaringsagain st theend of the metal cap, substantially as described.

9. The combination of a metal ca having an o ening at its end,' a metalinem er lying part y in said metal cap, and partly projecting throughthe opening in the .cap insulat an opening at its end, a metalmemberlying partly in said metal cap, and partly projectmg through the openingin the cap, insulating material in the form of axially-arrangedlaminations surrounding said metal number and partly surrounded by themetal cap, insulation consisting of radially-arranged rings surroundingthe above-mentioned insulatii'lg material surrounding the portion of themetal member projecting through the opening inthe cap, and meansclamping the abovementioned rings against the end of the metal cap,substantially as described.

1 l. The combination of a metal cap having an opening at its end, ametal member hav ing a head portion and a shank portion, the headportion lying in said metal cap and the shank portion projecting throughthe opening in the cap and having a screw-thread, insulatlng material inthe formof axially-arranged'lammatlons ofnnca surrounding said metalmember and partly surrounded by the metal cap, insulation consisting ofradiallyarranged mica ringssurrounding the abovementioned insulatingmaterial surrounding the projecting shank portion of the metal -member,and a nut on the scew-thread of said shank pressing the above-mentionedrings against the end of the metal cap, substantially as described. I

In Witness whereof I have hereunto signed my name in the presence of twosubscribing Witnesses.

MAX MEIROWSKY.

Witnesses:

WILLIAM KUErPERs, Jon. 801101112.

